Improvement in expanding borlng-tools



UNITED STATES PATENT QFFICE.

' JCSEPH K. KACEROVSKY, OF BRIDGEPORT, CONNECTICUT.

IMPROVEMENT IN EXPANDING BORING-TOOLS.

Specification forming part of Letters Patent No. 136,736, dated Marchll, 1873.

To all whom it may concern:

Be it known that I, J osEPH K. KAOER- OVSKY, of Bridgeport, in thecounty of Fairfield and State of Connecticut, have invented a new anduseful Improvement in Expanding Tools, of which the following is aspecification:

This invention consists in a novel construction of revolving expandingtool for turning, boring, drilling, orotherwise preparing ordressinginterior surfaces, including the cuttin g ofscrew-threads,'whereby great simplicity and efficiency are obtained asregards the inand-out adjustment of the cutters, and supportof the samewhen adjusted.

In the accompanying drawing, which forms part of this specification,Figure 1 represents a longitudinal section of an expanding toolconstructed in accordance with my invention; Fig. 2, a front end or faceview of the same, with a forward inner-grooved cam and capplate removed;Fig. 3, an inside face view of said cam; and Fig. 4, a transversesection on the line 00 ac.

Similar letters of reference indicate corresponding parts.

A represents the main body of the tool, which may be carried by itsshank b, in a lathe orother machine. B B are the cutters, titted so asto slide or admit of radial expansion in or out of a cutter-carrier, C,and which may either be plain or chased on their cuttingedges 8 s,accordingly as the tool is required to cut'plain or threaded surfaces.The tool may be fitted with. any number of these outters. Thecutter-carrier C, which projects in front of the main body A, isconnected with the latter by screw-thread, c, or otherwise. D is aspindle or arbor, having its bearing concentrically within the body Aand cutter-carrier C, and carrying or having attached to it a front andalso a back inner-grooved cam,

ends of the cutters B B Within them. The intermediate portion f of thisarbor, and central portions of the innergrooved cams E, are constructedto form a male cam, which, when the arbor D is turned in directionindicated by the arrow 3 acts against the backs of the cutters to forceand keep them pressed outward awhile by turning the arbor D in thereverse direction, as indicated by the arrow 2. The female orinner-grooved cams E E, acting against the trunnions d d, effect aninward adjustment and hold the cutters. In this Way a positive hold andadjustment of the cutters in both directions is insured.

The arbor D may be turned to eifect the required adjustment by means ofa handle or pin, g, inserted through a slot, h, in the body A, andentering a hole in. the arbor, the extent of its motion being limited byan adjustin g-screw t, The same handle or pin, in connection with alever Z, pivoted to the side of the body A, coming in contact withsuitable stops, may be used to automatically adjust the cutters outwardin a forward feed of the tool,

and draw them inward when the tool is run back; but such contrivancesform no part of this invention, and the turning of the arbor D to effectthe required outward adjustment of the cutters and their retraction, asrequired, may be accomplished by any suitable means.

What is here claimed, and desired to be secured by Letters Patent, is-

The male or cam-body portion f of the arbor D, in combination with thefemale or inner-grooved cams E, the radial sliding cutters B B, thecutter-carrier C, and main body A, substantially as specified.

JOSEPH K. KACEROVSKY.

Witnesses:

E. G. BURNHAM, W. A. PARROTT.

